Stephen Deach scripsit:
> What is the processing-side difference between "zxx" (no linguistic
> content) and "art" (artificial)?
Semantically, "art" refers to artificial human languages such as Esperanto
(which has its own code), Loglan, or Toki Pona. Processing any language
tag depends on the purpose of processing: if a text is tagged "art", and
your program has heuristics for telling one such language from another,
you might want to apply them; no such heuristics make sense for "zxx".
Most programs can only act on a tiny subset of the available language
tags in any event: to the great bulk of all software, "sco" and "nds"
are as opaque as "art" or "zxx".
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